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@ 2016-01-06T20:11:36Z

<?php

$str = '[locations][0][name]';

function angularModel ($formName, $inputName)
{
    $retVal  = "formData ['" . $formName . "']";
    $retVal .= preg_replace_callback ('/\[\w+\]/', function ($matches) {
        print_r ($matches);   
    }, $inputName);

    return $retVal;
}

angularModel ('relation', $str);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

76.05 ms | 402 KiB | 5 Q